There are crock pot adapter kits which, as near as I can tell, consist of a thermostat and a water circulator. No idea how well they work. They'd need a pretty good thermostat to keep the water temp so steady, which may or may not be realistic at the price point these things are at, and I also don't know if a crock pot heat element puts out enough energy to deal with the temp change from the addition of food.
I was reading that you can get a device that just powers the crock pot on and off to keep the temps 'steady'. Then I also found this.
Lifehacker mentioned just using a large cooler full of water. I may try that first just to see if its worth it.
edit: Whoa. That site I linked to is cool as fuck.
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